Question

x supra y = z supra t si yz=8, calculati 5xt-15 supra 3yz+1

Answer 1

$\frac{x}{y}= \frac{z}{t} \\ \\ yz=xt \\ \\ yz=8\\ \\ xt=8 \\ \\ \frac{5xt-15}{3yz+1} = \frac{5*8-15}{3*8+1} = \frac{25}{25} = 1$